轴承铆钉头脱落分析  

Analysis of Rivet Head Falling off of Bearing

作　　者：王晓东 WANG Xiao-dong(Aero Engine Corporation of China,Beijing 100097,China)

机构地区：[1]中国航空发动机集团,北京100097

出　　处：《失效分析与预防》2023年第4期264-269,共6页Failure Analysis and Prevention

摘　　要：轴承铝铆钉头在运输和使用过程中发生脱落。利用体视显微镜、金相显微镜、扫描电子显微镜等手段,对脱落的铆钉断口及截面进行宏微观形貌、微观组织分析测试。结果表明:铆钉为单侧钉头脱落,均位于原始铆合成型钉头一侧;脱落属于沿晶脆性断裂,原因与原始铆合成型钉头二次固溶再结晶产生的脆性界面和最终铆合过程产生的应力集中缺陷有关。建议采用双面铆合方式,保证轴承两侧铆钉头铆合状态的一致性,优化轴承铆合工艺方法,提高轴承铆合质量。The aluminum rivet heads of bearing fell off during transportation and service process.The macroscopic and microscopic morphology and microstructure of the fracture and cross section of the rivet which has fallen off were analyzed and measured by the stereo picroscope,metallographic microscope and scanning electron microscope.The results show that the rivets were unilaterally detached,and they were located on one side of the original riveted head.The fracture type was brittle intergranular fracture,and the reason was related to the brittle interface caused by the secondary solution recrystallization of the original riveting molding head and the stress concentration vacancy generated in the riveting process.It is recommended to use the double-sided riveting method to ensure the consistency of the riveting state of the rivet heads on both sides of the bearing,and optimize the bearing riveting process to improve the bearing riveting quality.

关 键 词：铆钉头 脱落 沿晶断裂 空缺 

分 类 号：TG115[金属学及工艺—物理冶金]